Store PDF anywhere in snow and use it in work order table using UI Action

[Adil a]

I have a requirement - I have a PDF file that I need to store in somewhere in servicenow and In the work order (wm_order) form I have to create a related link to download that PDF based on condition that work order type should be DSS then only the link should appear and when I click it that PDF should attached to the form (wm_order) or download. 

I have tired storing the PDF file on document template (sn_doc_template) table which has scoped app - Document Template and created related link on wm_order. And when clicked it the error is populating cross scoped privilege's

below is the ui action code to download the pdf 

function reopen() {
    var gr = new GlideRecord("sn_doc_template");
    gr.addQuery('sys_id', '068e2df1fbc24290b70ffb5ebeefdc8a');
    gr.query();
    var result = gr.getValue('document');
    // gs.addInfoMessage('hey');
    if (gr.next()) {
        current.u_proposal_attachment = result;
        gs.addInfoMessage('entered if');
        // gsftSubmit(null, g_form.getFormElement(), 'generate_pdf');
        action.setRedirectURL(current);
        return result;
        // }
 
    }